Taxes are so confusing

So I am wanting to start an Etsy shop, but a few things are keeping me from doing so and I’m trying to do some research before I just head straight into it. I read about the tax stuff and the forms but I’m just not understanding what I should do when and if my shop gets off the ground and I actually make profit. I am a 19 year old full time student in the US with no income so I haven’t started to pay taxes.I want to open a shop as a way to get some sort of income even if it’s small. Because I don’t pay taxes right now, how would paying my taxes work when I have my shop up and running and at some point start to get sales in? What forms will I use/fill out so I’m not doing anything illegal? And will I then need to start paying income tax and doing tax returns when I make a certain amount of money?